Uplink power control

ABSTRACT

Certain aspects of the present disclosure relate to methods and apparatus for uplink power control. Certain aspects provide a method for performing uplink power control at a base station (BS). The method includes determining a first configuration of one or more parameters for uplink power control at a user equipment (UE) based on a first spatial beam selected, from a plurality of spatial beams, for uplink communication of the UE. The method further includes transmitting a first indication of the first configuration to the UE.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Patent No.62/547,333, filed Aug. 18, 2017. The content of the provisionalapplication is hereby incorporated by reference in its entirety.

INTRODUCTION

The present disclosure relates generally to communication systems andmethods and apparatus for uplink power control.

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power). Examples of such multiple-access technologies includeLong Term Evolution (LTE) systems, code division multiple access (CDMA)systems, time division multiple access (TDMA) systems, frequencydivision multiple access (FDMA) systems, orthogonal frequency divisionmultiple access (OFDMA) systems, single-carrier frequency divisionmultiple access (SC-FDMA) systems, and time division synchronous codedivision multiple access (TD-SCDMA) systems.

In some examples, a wireless multiple-access communication system mayinclude a number of base stations, each simultaneously supportingcommunication for multiple communication devices, otherwise known asuser equipment (UEs). In LTE or LTE-A network, a set of one or more basestations may define an e NodeB (eNB). In other examples (e.g., in a nextgeneration or 5G network), a wireless multiple access communicationsystem may include a number of distributed units (DUs) (e.g., edge units(EUs), edge nodes (ENs), radio heads (RHs), smart radio heads (SRHs),transmission reception points (TRPs), etc.) in communication with anumber of central units (CUs) (e.g., central nodes (CNs), access nodecontrollers (ANCs), etc.), where a set of one or more distributed units,in communication with a central unit, may define an access node (e.g., anew radio base station (NR BS), a new radio node-B (NR NB), a networknode, 5G NB, gNB, gNodeB, eNB, etc.). A base station or DU maycommunicate with a set of UEs on downlink channels (e.g., fortransmissions from a base station or to a UE) and uplink channels (e.g.,for transmissions from a UE to a base station or distributed unit).

These multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent wireless devices to communicate on a municipal, national,regional, and even global level. An example of an emergingtelecommunication standard is new radio (NR), for example, 5G radioaccess. NR is a set of enhancements to the LTE mobile standardpromulgated by Third Generation Partnership Project (3GPP). It isdesigned to better support mobile broadband Internet access by improvingspectral efficiency, lowering costs, improving services, making use ofnew spectrum, and better integrating with other open standards usingOFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink(UL) as well as support beamforming, multiple-input multiple-output(MIMO) antenna technology, and carrier aggregation.

BRIEF SUMMARY

The systems, methods, and devices of the disclosure each have severalaspects, no single one of which is solely responsible for its desirableattributes. Without limiting the scope of this disclosure as expressedby the claims which follow, some features will now be discussed briefly.After considering this discussion, and particularly after reading thesection entitled “Detailed Description” one will understand how thefeatures of this disclosure provide advantages that include improvedcommunications between access points and stations in a wireless network.

Certain aspects provide a method for performing uplink power control ata base station (BS). The method includes determining a firstconfiguration of one or more parameters for uplink power control at auser equipment (UE) based on a first spatial beam selected, from aplurality of spatial beams, for uplink communication of the UE. Themethod further includes transmitting a first indication of the firstconfiguration to the UE.

Certain aspects provide a base station (BS) including a memory and aprocessor. The processor is configured to determine a firstconfiguration of one or more parameters for uplink power control at auser equipment (UE) based on a first spatial beam selected, from aplurality of spatial beams, for uplink communication of the UE. Theprocessor is further configured to transmit a first indication of thefirst configuration to the UE.

Certain aspects provide a base station (BS) including means fordetermining a first configuration of one or more parameters for uplinkpower control at a user equipment (UE) based on a first spatial beamselected, from a plurality of spatial beams, for uplink communication ofthe UE. The base station further includes means for transmitting a firstindication of the first configuration to the UE.

Certain aspects provide a non-transitory computer readable storagemedium that stores instructions that when executed by a base station(BS) causes the base station to perform a method for performing uplinkpower control at the BS. The method includes determining a firstconfiguration of one or more parameters for uplink power control at auser equipment (UE) based on a first spatial beam selected, from aplurality of spatial beams, for uplink communication of the UE. Themethod further includes transmitting a first indication of the firstconfiguration to the UE.

Aspects generally include methods, apparatus, systems, computer readablemediums, and processing systems, as substantially described herein withreference to and as illustrated by the accompanying drawings.

To the accomplishment of the foregoing and related ends, the one or moreaspects comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe annexed drawings set forth in detail certain illustrative featuresof the one or more aspects. These features are indicative, however, ofbut a few of the various ways in which the principles of various aspectsmay be employed, and this description is intended to include all suchaspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the manner in which the above-recited features of the presentdisclosure can be understood in detail, a more particular description,briefly summarized above, may be had by reference to aspects, some ofwhich are illustrated in the appended drawings. It is to be noted,however, that the appended drawings illustrate only certain typicalaspects of this disclosure and are therefore not to be consideredlimiting of its scope, for the description may admit to other equallyeffective aspects.

FIG. 1 is a block diagram conceptually illustrating an exampletelecommunications system, in accordance with certain aspects of thepresent disclosure.

FIG. 2 is a block diagram illustrating an example logical architectureof a distributed RAN, in accordance with certain aspects of the presentdisclosure.

FIG. 3 is a diagram illustrating an example physical architecture of adistributed RAN, in accordance with certain aspects of the presentdisclosure.

FIG. 4 is a block diagram conceptually illustrating a design of anexample BS and user equipment (UE), in accordance with certain aspectsof the present disclosure.

FIG. 5 is a diagram showing examples for implementing a communicationprotocol stack, in accordance with certain aspects of the presentdisclosure.

FIG. 6 illustrates an example of a DL-centric subframe, in accordancewith certain aspects of the present disclosure.

FIG. 7 illustrates an example of an UL-centric subframe, in accordancewith certain aspects of the present disclosure.

FIG. 8 illustrates example operations for uplink power control for a UE,in accordance with certain aspects.

FIG. 9 illustrates a communications device that may include variouscomponents configured to perform operations for the techniques disclosedherein in accordance with aspects of the present disclosure.

To facilitate understanding, identical reference numerals have beenused, where possible, to designate identical elements that are common tothe figures. It is contemplated that elements disclosed in one aspectmay be beneficially utilized on other aspects without specificrecitation.

DETAILED DESCRIPTION

NR may support various wireless communication services, such as Enhancedmobile broadband (eMBB) targeting wide bandwidth (e.g. 80 MHz beyond),millimeter wave (mmW) targeting high carrier frequency (e.g. 60 GHz),massive MTC (mMTC) targeting non-backward compatible MTC techniques,and/or mission critical targeting ultra reliable low latencycommunications (URLLC). These services may include latency andreliability requirements. These services may also have differenttransmission time intervals (TTI) to meet respective quality of service(QoS) requirements. In addition, these services may co-exist in the samesubframe.

Aspects of the present disclosure relate to systems and method foruplink power control. For example, a user equipment (UE) may beconfigured to transmit signals to a base station (BS) on an uplink. Theuplink power with which the UE transmits signals carrying data, controlinformation, reference signals, or the like to the BS may be controlledas part of an uplink power control scheme. In particular, the uplinkpower for transmitting by the UE may be controlled to ensure thatsignals are received with sufficient strength (e.g., with a thresholdquality, such as signal to interference and noise ratio (SINR)) at theBS that the information or data carried in the signals can be retrievedfrom the signals. Further, the uplink power for transmitting by the UEmay be controlled to mitigate (e.g., minimize) interference to otherdevices (e.g., UEs and BSs in the same or different cells) that may alsoreceive the signals (e.g., as interference).

In certain aspects, a UE may communicate on the uplink with one or moreBSs or transmission reception points (TRPs) using beamforming where theUE spatially directs transmissions as different beams in one or moredirections to the one or more transmission reception points. In certainaspects, one or more parameters used for performing uplink control maybe configured on a per beam basis, or a per cell basis (e.g., per TRPbasis) according to the techniques discussed herein.

The following description provides examples, and is not limiting of thescope, applicability, or examples set forth in the claims. Changes maybe made in the function and arrangement of elements discussed withoutdeparting from the scope of the disclosure. Various examples may omit,substitute, or add various procedures or components as appropriate. Forinstance, the methods described may be performed in an order differentfrom that described, and various steps may be added, omitted, orcombined. Also, features described with respect to some examples may becombined in some other examples. For example, an apparatus may beimplemented or a method may be practiced using any number of the aspectsset forth herein. In addition, the scope of the disclosure is intendedto cover such an apparatus or method which is practiced using otherstructure, functionality, or structure and functionality in addition toor other than the various aspects of the disclosure set forth herein. Itshould be understood that any aspect of the disclosure disclosed hereinmay be embodied by one or more elements of a claim. The word “exemplary”is used herein to mean “serving as an example, instance, orillustration.” Any aspect described herein as “exemplary” is notnecessarily to be construed as preferred or advantageous over otheraspects.

The techniques described herein may be used for various wirelesscommunication networks such as LTE, CDMA, TDMA, FDMA, OFDMA, SC-FDMA andother networks. The terms “network” and “system” are often usedinterchangeably. A CDMA network may implement a radio technology such asUniversal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includesWideband CDMA (WCDMA) and other variants of CDMA. cdma2000 coversIS-2000, IS-95 and IS-856 standards. A TDMA network may implement aradio technology such as Global System for Mobile Communications (GSM).An OFDMA network may implement a radio technology such as NR (e.g. 5GRA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11(Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRA andE-UTRA are part of Universal Mobile Telecommunication System (UMTS). NRis an emerging wireless communications technology under development inconjunction with the 5G Technology Forum (5GTF). 3GPP Long TermEvolution (LTE) and LTE-Advanced (LTE-A) are releases of UMTS that useE-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described indocuments from an organization named “3rd Generation PartnershipProject” (3GPP). cdma2000 and UMB are described in documents from anorganization named “3rd Generation Partnership Project 2” (3GPP2). Thetechniques described herein may be used for the wireless networks andradio technologies mentioned above as well as other wireless networksand radio technologies. For clarity, while aspects may be describedherein using terminology commonly associated with 3G and/or 4G wirelesstechnologies, aspects of the present disclosure can be applied in othergeneration-based communication systems, such as 5G and later, includingNR technologies.

Example Wireless Communications System

FIG. 1 illustrates an example wireless network 100, such as a new radio(NR) or 5G network, in which aspects of the present disclosure may beperformed. For example, in certain aspects, a BS 110 configures one ormore parameters used for performing uplink control on a per beam basis,or a per cell basis (e.g., per TRP basis) according to the techniquesdiscussed herein.

As illustrated in FIG. 1, the wireless network 100 may include a numberof BSs 110 and other network entities. A BS may be a station thatcommunicates with UEs. Each BS 110 may provide communication coveragefor a particular geographic area. In 3GPP, the term “cell” can refer toa coverage area of a Node B and/or a Node B subsystem serving thiscoverage area, depending on the context in which the term is used. In NRsystems, the term “cell” and eNB, gNB, gNodeB, Node B, 5G NB, AP, NR BS,or TRP may be interchangeable. In some examples, a cell may notnecessarily be stationary, and the geographic area of the cell may moveaccording to the location of a mobile base station. In some examples,the base stations may be interconnected to one another and/or to one ormore other base stations or network nodes (not shown) in the wirelessnetwork 100 through various types of backhaul interfaces such as adirect physical connection, a virtual network, or the like using anysuitable transport network.

In general, any number of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular radioaccess technology (RAT) and may operate on one or more frequencies. ARAT may also be referred to as a radio technology, an air interface,etc. A frequency may also be referred to as a carrier, a frequencychannel, etc. Each frequency may support a single RAT in a givengeographic area in order to avoid interference between wireless networksof different RATs. In some cases, NR or 5G RAT networks may be deployed.

A BS may provide communication coverage for a macro cell, a pico cell, afemto cell, and/or other types of cell. A macro cell may cover arelatively large geographic area (e.g., several kilometers in radius)and may allow unrestricted access by UEs with service subscription. Apico cell may cover a relatively small geographic area and may allowunrestricted access by UEs with service subscription. A femto cell maycover a relatively small geographic area (e.g., a home) and may allowrestricted access by UEs having association with the femto cell (e.g.,UEs in a Closed Subscriber Group (CSG), UEs for users in the home,etc.). A BS for a macro cell may be referred to as a macro BS. A BS fora pico cell may be referred to as a pico BS. A BS for a femto cell maybe referred to as a femto BS or a home BS. In the example shown in FIG.1, the BSs 110 a, 110 b and 110 c may be macro BSs for the macro cells102 a, 102 b and 102 c, respectively. The BS 110 x may be a pico BS fora pico cell 102 x. The BSs 110 y and 110 z may be femto BS for the femtocells 102 y and 102 z, respectively. A BS may support one or multiple(e.g., three) cells.

The wireless network 100 may also include relay stations. A relaystation is a station that receives a transmission of data and/or otherinformation from an upstream station (e.g., a BS or a UE) and sends atransmission of the data and/or other information to a downstreamstation (e.g., a UE or a BS). A relay station may also be a UE thatrelays transmissions for other UEs. In the example shown in FIG. 1, arelay station 110 r may communicate with the BS 110 a and a UE 120 r inorder to facilitate communication between the BS 110 a and the UE 120 r.A relay station may also be referred to as a relay BS, a relay, etc.

The wireless network 100 may be a heterogeneous network that includesBSs of different types, e.g., macro BS, pico BS, femto BS, relays, etc.These different types of BSs may have different transmit power levels,different coverage areas, and different impact on interference in thewireless network 100. For example, macro BS may have a high transmitpower level (e.g., 20 Watts) whereas pico BS, femto BS, and relays mayhave a lower transmit power level (e.g., 1 Watt).

The wireless network 100 may support synchronous or asynchronousoperation. For synchronous operation, the BSs may have similar frametiming, and transmissions from different BSs may be approximatelyaligned in time. For asynchronous operation, the BSs may have differentframe timing, and transmissions from different BSs may not be aligned intime. The techniques described herein may be used for both synchronousand asynchronous operation.

A network controller 130 may be coupled to a set of BSs and providecoordination and control for these BSs. The network controller 130 maycommunicate with the BSs 110 via a backhaul. The BSs 110 may alsocommunicate with one another, e.g., directly or indirectly via wirelessor wireline backhaul.

The UEs 120 (e.g., 120 x, 120 y, etc.) may be dispersed throughout thewireless network 100, and each UE may be stationary or mobile. A UE mayalso be referred to as a mobile station, a terminal, an access terminal,a subscriber unit, a station, a Customer Premises Equipment (CPE), acellular phone, a smart phone, a personal digital assistant (PDA), awireless modem, a wireless communication device, a handheld device, alaptop computer, a cordless phone, a wireless local loop (WLL) station,a tablet, a camera, a gaming device, a netbook, a smartbook, anultrabook, a medical device or medical equipment, a biometricsensor/device, a wearable device such as a smart watch, smart clothing,smart glasses, a smart wrist band, smart jewelry (e.g., a smart ring, asmart bracelet, etc.), an entertainment device (e.g., a music device, avideo device, a satellite radio, etc.), a vehicular component or sensor,a smart meter/sensor, industrial manufacturing equipment, a globalpositioning system device, or any other suitable device that isconfigured to communicate via a wireless or wired medium. Some UEs maybe considered evolved or machine-type communication (MTC) devices orevolved MTC (eMTC) devices. MTC and eMTC UEs include, for example,robots, drones, remote devices, sensors, meters, monitors, locationtags, etc., that may communicate with a BS, another device (e.g., remotedevice), or some other entity. A wireless node may provide, for example,connectivity for or to a network (e.g., a wide area network such asInternet or a cellular network) via a wired or wireless communicationlink. Some UEs may be considered Internet-of-Things (IoT) devices.

In FIG. 1, a solid line with double arrows indicates desiredtransmissions between a UE and a serving BS, which is a BS designated toserve the UE on the downlink and/or uplink. A dashed line with doublearrows indicates interfering transmissions between a UE and a BS.

In certain aspects, as shown, a UE 120 may be configured to transmitsignals on an uplink to the BS 110. The BS 110 may be configured toconfigure the UE 120 to perform uplink power control on the uplink,according to the techniques discussed herein.

Certain wireless networks (e.g., LTE) utilize orthogonal frequencydivision multiplexing (OFDM) on the downlink and single-carrierfrequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDMpartition the system bandwidth into multiple (K) orthogonal subcarriers,which are also commonly referred to as tones, bins, etc. Each subcarriermay be modulated with data. In general, modulation symbols are sent inthe frequency domain with OFDM and in the time domain with SC-FDM. Thespacing between adjacent subcarriers may be fixed, and the total numberof subcarriers (K) may be dependent on the system bandwidth. Forexample, the spacing of the subcarriers may be 15 kHz and the minimumresource allocation (called a ‘resource block’) may be 12 subcarriers(or 180 kHz). Consequently, the nominal FFT size may be equal to 128,256, 512, 1024 or 2048 for system bandwidth of 1.25, 2.5, 5, 10 or 20megahertz (MHz), respectively. The system bandwidth may also bepartitioned into subbands. For example, a subband may cover 1.08 MHz(i.e., 6 resource blocks), and there may be 1, 2, 4, 8 or 16 subbandsfor system bandwidth of 1.25, 2.5, 5, 10 or 20 MHz, respectively.

While aspects of the examples described herein may be associated withLTE technologies, aspects of the present disclosure may be applicablewith other wireless communications systems, such as NR. NR may utilizeOFDM with a CP on the uplink and downlink and include support forhalf-duplex operation using time division duplex (TDD). A singlecomponent carrier bandwidth of 100 MHz may be supported. NR resourceblocks may span 12 sub-carriers with a sub-carrier bandwidth of 75 kHzover a 0.1 ms duration. Each radio frame may consist of 50 subframeswith a length of 10 ms. Consequently, each subframe may have a length of0.2 ms. Each subframe may indicate a link direction (i.e., DL or UL) fordata transmission and the link direction for each subframe may bedynamically switched. Each subframe may include DL/UL data as well asDL/UL control data. UL and DL subframes for NR may be as described inmore detail below with respect to FIGS. 6 and 7. Beamforming may besupported and beam direction may be dynamically configured. MIMOtransmissions with precoding may also be supported. MIMO configurationsin the DL may support up to 8 transmit antennas with multi-layer DLtransmissions up to 8 streams and up to 2 streams per UE. Multi-layertransmissions with up to 2 streams per UE may be supported. Aggregationof multiple cells may be supported with up to 8 serving cells.Alternatively, NR may support a different air interface, other than anOFDM-based. NR networks may include entities such CUs and/or DUs.

In some examples, access to the air interface may be scheduled, whereina scheduling entity (e.g., a base station) allocates resources forcommunication among some or all devices and equipment within its servicearea or cell. Within the present disclosure, as discussed further below,the scheduling entity may be responsible for scheduling, assigning,reconfiguring, and releasing resources for one or more subordinateentities. That is, for scheduled communication, subordinate entitiesutilize resources allocated by the scheduling entity. Base stations arenot the only entities that may function as a scheduling entity. That is,in some examples, a UE may function as a scheduling entity, schedulingresources for one or more subordinate entities (e.g., one or more otherUEs). In this example, the UE is functioning as a scheduling entity, andother UEs utilize resources scheduled by the UE for wirelesscommunication. A UE may function as a scheduling entity in apeer-to-peer (P2P) network, and/or in a mesh network. In a mesh networkexample, UEs may optionally communicate directly with one another inaddition to communicating with the scheduling entity.

Thus, in a wireless communication network with a scheduled access totime-frequency resources and having a cellular configuration, a P2Pconfiguration, and a mesh configuration, a scheduling entity and one ormore subordinate entities may communicate utilizing the scheduledresources.

As noted above, a RAN may include a CU and DUs. A NR BS (e.g., eNB, 5GNode B, Node B, transmission reception point (TRP), access point (AP))may correspond to one or multiple BSs. NR cells can be configured asaccess cell (ACells) or data only cells (DCells). For example, the RAN(e.g., a central unit or distributed unit) can configure the cells.DCells may be cells used for carrier aggregation or dual connectivity,but not used for initial access, cell selection/reselection, orhandover. In some cases DCells may not transmit synchronizationsignals—in some case cases DCells may transmit SS. NR BSs may transmitdownlink signals to UEs indicating the cell type. Based on the cell typeindication, the UE may communicate with the NR BS. For example, the UEmay determine NR BSs to consider for cell selection, access, handover,and/or measurement based on the indicated cell type.

FIG. 2 illustrates an example logical architecture of a distributedradio access network (RAN) 200, which may be implemented in the wirelesscommunication system illustrated in FIG. 1. A 5G access node 206 mayinclude an access node controller (ANC) 202. The ANC may be a centralunit (CU) of the distributed RAN 200. The backhaul interface to the nextgeneration core network (NG-CN) 204 may terminate at the ANC. Thebackhaul interface to neighboring next generation access nodes (NG-ANs)may terminate at the ANC. The ANC may include one or more TRPs 208(which may also be referred to as BSs, NR BSs, Node Bs, 5G NBs, APs, orsome other term). As described above, a TRP may be used interchangeablywith “cell.”

The TRPs 208 may be a DU. The TRPs may be connected to one ANC (ANC 202)or more than one ANC (not illustrated). For example, for RAN sharing,radio as a service (RaaS), and service specific AND deployments, the TRPmay be connected to more than one ANC. A TRP may include one or moreantenna ports. The TRPs may be configured to individually (e.g., dynamicselection) or jointly (e.g., joint transmission) serve traffic to a UE.

The local architecture 200 may be used to illustrate fronthauldefinition. The architecture may be defined that support fronthaulingsolutions across different deployment types. For example, thearchitecture may be based on transmit network capabilities (e.g.,bandwidth, latency, and/or jitter).

The architecture may share features and/or components with LTE.According to aspects, the next generation AN (NG-AN) 210 may supportdual connectivity with NR. The NG-AN may share a common fronthaul forLTE and NR.

The architecture may enable cooperation between and among TRPs 208. Forexample, cooperation may be preset within a TRP and/or across TRPs viathe ANC 202. According to aspects, no inter-TRP interface may beneeded/present.

According to aspects, a dynamic configuration of split logical functionsmay be present within the architecture 200. As will be described in moredetail with reference to FIG. 5, the Radio Resource Control (RRC) layer,Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC)layer, Medium Access Control (MAC) layer, and a Physical (PHY) layersmay be adaptably placed at the DU or CU (e.g., TRP or ANC,respectively). According to certain aspects, a BS may include a centralunit (CU) (e.g., ANC 202) and/or one or more distributed units (e.g.,one or more TRPs 208).

FIG. 3 illustrates an example physical architecture of a distributed RAN300, according to aspects of the present disclosure. A centralized corenetwork unit (C-CU) 302 may host core network functions. The C-CU may becentrally deployed. C-CU functionality may be offloaded (e.g., toadvanced wireless services (AWS)), in an effort to handle peak capacity.

A centralized RAN unit (C-RU) 304 may host one or more ANC functions.Optionally, the C-RU may host core network functions locally. The C-RUmay have distributed deployment. The C-RU may be closer to the networkedge.

A DU 306 may host one or more TRPs (edge node (EN), an edge unit (EU), aradio head (RH), a smart radio head (SRH), or the like). The DU may belocated at edges of the network with radio frequency (RF) functionality.

FIG. 4 illustrates example components of the BS 110 and UE 120illustrated in FIG. 1, which may be used to implement aspects of thepresent disclosure. As described above, the BS may include a TRP. One ormore components of the BS 110 and UE 120 may be used to practice aspectsof the present disclosure. For example, antennas 452, Tx/Rx 222,processors 466, 458, 464, and/or controller/processor 480 of the UE 120and/or antennas 434, processors 460, 420, 438, and/orcontroller/processor 440 of the BS 110 may be used to perform theoperations described herein.

FIG. 4 shows a block diagram of a design of a BS 110 and a UE 120, whichmay be one of the BSs and one of the UEs in FIG. 1. For a restrictedassociation scenario, the base station 110 may be the macro BS 110 c inFIG. 1, and the UE 120 may be the UE 120 y. The base station 110 mayalso be a base station of some other type. The base station 110 may beequipped with antennas 434 a through 434 t, and the UE 120 may beequipped with antennas 452 a through 452 r.

At the base station 110, a transmit processor 420 may receive data froma data source 412 and control information from a controller/processor440. The control information may be for the Physical Broadcast Channel(PBCH), Physical Control Format Indicator Channel (PCFICH), PhysicalHybrid ARQ Indicator Channel (PHICH), Physical Downlink Control Channel(PDCCH), etc. The data may be for the Physical Downlink Shared Channel(PDSCH), etc. The processor 420 may process (e.g., encode and symbolmap) the data and control information to obtain data symbols and controlsymbols, respectively. The processor 420 may also generate referencesymbols, e.g., for the PSS, SSS, DMRS, and cell-specific referencesignal. A transmit (TX) multiple-input multiple-output (MIMO) processor430 may perform spatial processing (e.g., precoding) on the datasymbols, the control symbols, and/or the reference symbols, ifapplicable, and may provide output symbol streams to the modulators(MODs) 432 a through 432 t. Each modulator 432 may process a respectiveoutput symbol stream (e.g., for OFDM, etc.) to obtain an output samplestream. Each modulator 432 may further process (e.g., convert to analog,amplify, filter, and upconvert) the output sample stream to obtain adownlink signal. Downlink signals from modulators 432 a through 432 tmay be transmitted via the antennas 434 a through 434 t, respectively.

At the UE 120, the antennas 452 a through 452 r may receive the downlinksignals from the base station 110 and may provide received signals tothe demodulators (DEMODs) 454 a through 454 r, respectively. Eachdemodulator 454 may condition (e.g., filter, amplify, downconvert, anddigitize) a respective received signal to obtain input samples. Eachdemodulator 454 may further process the input samples (e.g., for OFDM,etc.) to obtain received symbols. A MIMO detector 456 may obtainreceived symbols from all the demodulators 454 a through 454 r, performMIMO detection on the received symbols if applicable, and providedetected symbols. A receive processor 458 may process (e.g., demodulate,deinterleave, and decode) the detected symbols, provide decoded data forthe UE 120 to a data sink 460, and provide decoded control informationto a controller/processor 480.

On the uplink, at the UE 120, a transmit processor 464 may receive andprocess data (e.g., for the Physical Uplink Shared Channel (PUSCH)) froma data source 462 and control information (e.g., for the Physical UplinkControl Channel (PUCCH) from the controller/processor 480. The transmitprocessor 464 may also generate reference symbols for a referencesignal. The symbols from the transmit processor 464 may be precoded by aTX MIMO processor 466 if applicable, further processed by thedemodulators 454 a through 454 r (e.g., for SC-FDM, etc.), andtransmitted to the base station 110. At the BS 110, the uplink signalsfrom the UE 120 may be received by the antennas 434, processed by themodulators 432, detected by a MIMO detector 436 if applicable, andfurther processed by a receive processor 438 to obtain decoded data andcontrol information sent by the UE 120. The receive processor 438 mayprovide the decoded data to a data sink 439 and the decoded controlinformation to the controller/processor 440.

The controllers/processors 440 and 480 may direct the operation at thebase station 110 and the UE 120, respectively. The processor 440 and/orother processors and modules at the base station 110 may perform ordirect processes for the techniques described herein. The processor 480and/or other processors and modules at the UE 120 may also perform ordirect processes for the techniques described herein. The memories 442and 482 may store data and program codes for the BS 110 and the UE 120,respectively. A scheduler 444 may schedule UEs for data transmission onthe downlink and/or uplink.

FIG. 5 illustrates a diagram 500 showing examples for implementing acommunications protocol stack, according to aspects of the presentdisclosure. The illustrated communications protocol stacks may beimplemented by devices operating in a in a 5G system (e.g., a systemthat supports uplink-based mobility). Diagram 500 illustrates acommunications protocol stack including a Radio Resource Control (RRC)layer 510, a Packet Data Convergence Protocol (PDCP) layer 515, a RadioLink Control (RLC) layer 520, a Medium Access Control (MAC) layer 525,and a Physical (PHY) layer 530. In various examples the layers of aprotocol stack may be implemented as separate modules of software,portions of a processor or ASIC, portions of non-collocated devicesconnected by a communications link, or various combinations thereof.Collocated and non-collocated implementations may be used, for example,in a protocol stack for a network access device (e.g., ANs, CUs, and/orDUs) or a UE.

A first option 505-a shows a split implementation of a protocol stack,in which implementation of the protocol stack is split between acentralized network access device (e.g., an ANC 202 in FIG. 2) anddistributed network access device (e.g., DU 208 in FIG. 2). In the firstoption 505-a, an RRC layer 510 and a PDCP layer 515 may be implementedby the central unit, and an RLC layer 520, a MAC layer 525, and a PHYlayer 530 may be implemented by the DU. In various examples the CU andthe DU may be collocated or non-collocated. The first option 505-a maybe useful in a macro cell, micro cell, or pico cell deployment.

A second option 505-b shows a unified implementation of a protocolstack, in which the protocol stack is implemented in a single networkaccess device (e.g., access node (AN), new radio base station (NR BS), anew radio Node-B (NR NB), a network node (NN), or the like.). In thesecond option, the RRC layer 510, the PDCP layer 515, the RLC layer 520,the MAC layer 525, and the PHY layer 530 may each be implemented by theAN. The second option 505-b may be useful in a femto cell deployment.

Regardless of whether a network access device implements part or all ofa protocol stack, a UE may implement an entire protocol stack (e.g., theRRC layer 510, the PDCP layer 515, the RLC layer 520, the MAC layer 525,and the PHY layer 530).

FIG. 6 is a diagram 600 showing an example of a DL-centric subframe. TheDL-centric subframe may include a control portion 602. The controlportion 602 may exist in the initial or beginning portion of theDL-centric subframe. The control portion 602 may include variousscheduling information and/or control information corresponding tovarious portions of the DL-centric subframe. In some configurations, thecontrol portion 602 may be a physical DL control channel (PDCCH), asindicated in FIG. 6. The DL-centric subframe may also include a DL dataportion 604. The DL data portion 604 may sometimes be referred to as thepayload of the DL-centric subframe. The DL data portion 604 may includethe communication resources utilized to communicate DL data from thescheduling entity (e.g., UE or BS) to the subordinate entity (e.g., UE).In some configurations, the DL data portion 604 may be a physical DLshared channel (PDSCH).

The DL-centric subframe may also include a common UL portion 606. Thecommon UL portion 606 may sometimes be referred to as an UL burst, acommon UL burst, and/or various other suitable terms. The common ULportion 606 may include feedback information corresponding to variousother portions of the DL-centric subframe. For example, the common ULportion 606 may include feedback information corresponding to thecontrol portion 602. Non-limiting examples of feedback information mayinclude an ACK signal, a NACK signal, a HARQ indicator, and/or variousother suitable types of information. The common UL portion 606 mayinclude additional or alternative information, such as informationpertaining to random access channel (RACH) procedures, schedulingrequests (SRs), and various other suitable types of information. Asillustrated in FIG. 6, the end of the DL data portion 604 may beseparated in time from the beginning of the common UL portion 606. Thistime separation may sometimes be referred to as a gap, a guard period, aguard interval, and/or various other suitable terms. This separationprovides time for the switch-over from DL communication (e.g., receptionoperation by the subordinate entity (e.g., UE)) to UL communication(e.g., transmission by the subordinate entity (e.g., UE)). One ofordinary skill in the art will understand that the foregoing is merelyone example of a DL-centric subframe and alternative structures havingsimilar features may exist without necessarily deviating from theaspects described herein.

FIG. 7 is a diagram 700 showing an example of an UL-centric subframe.The UL-centric subframe may include a control portion 702. The controlportion 702 may exist in the initial or beginning portion of theUL-centric subframe. The control portion 702 in FIG. 7 may be similar tothe control portion described above with reference to FIG. 6. TheUL-centric subframe may also include an UL data portion 704. The UL dataportion 704 may sometimes be referred to as the payload of theUL-centric subframe. The UL portion may refer to the communicationresources utilized to communicate UL data from the subordinate entity(e.g., UE) to the scheduling entity (e.g., UE or BS). In someconfigurations, the control portion 702 may be a physical DL controlchannel (PDCCH).

As illustrated in FIG. 7, the end of the control portion 702 may beseparated in time from the beginning of the UL data portion 704. Thistime separation may sometimes be referred to as a gap, guard period,guard interval, and/or various other suitable terms. This separationprovides time for the switch-over from DL communication (e.g., receptionoperation by the scheduling entity) to UL communication (e.g.,transmission by the scheduling entity). The UL-centric subframe may alsoinclude a common UL portion 706. The common UL portion 706 in FIG. 7 maybe similar to the common UL portion 706 described above with referenceto FIG. 7. The common UL portion 706 may additional or alternativeinclude information pertaining to channel quality indicator (CQI),sounding reference signals (SRSs), and various other suitable types ofinformation. One of ordinary skill in the art will understand that theforegoing is merely one example of an UL-centric subframe andalternative structures having similar features may exist withoutnecessarily deviating from the aspects described herein.

In some circumstances, two or more subordinate entities (e.g., UEs) maycommunicate with each other using sidelink signals. Real-worldapplications of such sidelink communications may include public safety,proximity services, UE-to-network relaying, vehicle-to-vehicle (V2V)communications, Internet of Everything (IoE) communications, IoTcommunications, mission-critical mesh, and/or various other suitableapplications. Generally, a sidelink signal may refer to a signalcommunicated from one subordinate entity (e.g., UE1) to anothersubordinate entity (e.g., UE2) without relaying that communicationthrough the scheduling entity (e.g., UE or BS), even though thescheduling entity may be utilized for scheduling and/or controlpurposes. In some examples, the sidelink signals may be communicatedusing a licensed spectrum (unlike wireless local area networks, whichtypically use an unlicensed spectrum).

A UE may operate in various radio resource configurations, including aconfiguration associated with transmitting pilots using a dedicated setof resources (e.g., a radio resource control (RRC) dedicated state,etc.) or a configuration associated with transmitting pilots using acommon set of resources (e.g., an RRC common state, etc.). Whenoperating in the RRC dedicated state, the UE may select a dedicated setof resources for transmitting a pilot signal to a network. Whenoperating in the RRC common state, the UE may select a common set ofresources for transmitting a pilot signal to the network. In eithercase, a pilot signal transmitted by the UE may be received by one ormore network access devices, such as an AN, or a DU, or portionsthereof. Each receiving network access device may be configured toreceive and measure pilot signals transmitted on the common set ofresources, and also receive and measure pilot signals transmitted ondedicated sets of resources allocated to the UEs for which the networkaccess device is a member of a monitoring set of network access devicesfor the UE. One or more of the receiving network access devices, or a CUto which receiving network access device(s) transmit the measurements ofthe pilot signals, may use the measurements to identify serving cellsfor the UEs, or to initiate a change of serving cell for one or more ofthe UEs.

Example Uplink Power Control

Aspects of the present disclosure relate to uplink power control oftransmission of a UE to a BS on an uplink. For example, a UE 120 may beconnected to BS 110 and configured to transmit signals to the BS 110 onone or more uplink channels (e.g., PUSCH, PUCCH, SRS, etc.). In certainaspects, the UE 120 may be configured to perform power control fortransmissions on the uplink to the BS 110 (i.e., uplink power control)based on one or more parameters.

For example, on the PUSCH, UE 120 may be configured to use the followingequation for power control:P _(PUSCH)(i)=min{P _(CMAX),10 log₁₀(M _(PUSCH)(i))+P_(O_PUSCH)(j)+α(j)·PL+Δ_(TF)(i)+ƒ(i)}  (1)Here, (i) refers to a particular subframe on the uplink for which theequation applies. P_(PUSCH)(i) refers to the transmit power used by theUE 120 to transmit to the BS 110 on the PUSCH. The parameter P_(CMAX)refers to the maximum transmission power the UE 120 is configured touse. The parameter M_(PUSCH)(i) refers to the bandwidth of the PUSCHresource assignment (e.g., resource blocks (RBs)) allocated to the UE120 for transmission on the PUSCH. The parameter P_(O_PUSCH)(j) (anexample of a P₀ parameter) refers to a target received power (e.g., whenassuming 0 dB of path loss (PL)) at the BS 110 for signals sent from theUE 120 to the BS 110 on the PUSCH (e.g., j=0—for a transmissioncorresponding to a semi persistent grant (SPS); j=1—for a transmissioncorresponding to a dynamic scheduled grant; j=2 for a transmissioncorresponding to a random access response (RAR) grant). The parameterα(j) refers to a compensation factor (e.g., PL compensation factor). Theparameter PL refers to the downlink path loss estimate as calculated byUE 120 based on reference symbol received power (RSRP) calculated forone or more reference signals (RSs) transmitted by the BS 110 to the UE120 on the downlink. The parameter Δ_(TF)(i) refers to a correctivefactor that depends on a modulation coding scheme (MCS). The parameterƒ(i) refers to a closed loop component that uses feedback from the UE120 to modify the transmit power (an example of a function for closedloop control for changing a power level used for transmitting by the UEon the uplink based on feedback from the BS).

In another example, on the PUCCH, UE 120 may be configured to use thefollowing equation for power control:P _(PUCCH)(i)=min{P _(CMAX) ,h(CQI,HARQ,SR)+P_(O_PUCCH)+PL+Δ_(F)(F)+Δ_(TxD)(F′)+g(i)}  (2)Here, (i) refers to a particular subframe on the uplink for which theequation applies. P_(PUCCH)(i) refers to the transmit power used by theUE 120 to transmit to the BS 110 on the PUCCH. The parameter P_(CMAX)refers to the maximum transmission power the UE 120 is configured touse. The parameter h(CQI,HARQ,SR) refers to a specific number based onthe number of channel quality indicator (CQI) bits, number of HARQvalue, and number of scheduling request (SR). The parameter P_(O_PUCCH)(an example of a P₀ parameter) refers to a target received power (e.g.,when assuming 0 dB of path loss (PL)) at the BS 110 for signals sentfrom the UE 120 to the BS 110 on the PUCCH. The parameter PL refers tothe downlink path loss estimate as calculated by UE 120 based onreference symbol received power (RSRP) calculated for one or morereference signals (RSs) transmitted by the BS 110 to the UE 120 on thedownlink. The parameter Δ_(F)(F) refers to a power offset based on thePUCCH format. The parameter Δ_(TxD)(F′) refers to a power offset basedon the PUCCH transmit diversity. The parameter g(i) refers to a closedloop component that uses feedback from the UE 120 to modify the transmitpower (an example of a function for closed loop control for changing apower level used for transmitting by the UE on the uplink based onfeedback from the BS).

In another example, for SRS transmission, UE 120 may be configured touse the following equation for power control:P _(SRS)(i)=min{P _(CMAX),10 log₁₀(M _(SRS)(i))+P _(O_SRS)(j)+α(j)PL+P_(SRS_offset)+ƒ(i)}  (3)Here, (i) refers to a particular subframe on the uplink for which theequation applies. P_(SRS)(i) refers to the transmit power used by the UE120 to transmit SRS to the BS 110 on the uplink. The parameter P_(CMAX)refers to the maximum transmission power the UE 120 is configured touse. The parameter M_(SRS)(i) refers to the bandwidth of the resourceassignment (e.g., resource blocks (RBs)) allocated to the UE 120 fortransmission of SRS. The parameter P_(O_SRS)(j) (an example of a P₀parameter) refers to a target received power (e.g., when assuming 0 dBof path loss (PL)) at the BS 110 for SRS sent from the UE 120 to the BS110 (e.g., j=0—for a transmission corresponding to a semi persistentgrant (SPS); j=1—for a transmission corresponding to a dynamic scheduledgrant; j=2 for a transmission corresponding to a random access response(RAR) grant). The parameter α(j) refers to a compensation factor (e.g.,PL compensation factor). The parameter PL refers to the downlink pathloss estimate as calculated by UE 120 based on reference symbol receivedpower (RSRP) calculated for one or more reference signals (RSs)transmitted by the BS 110 to the UE 120 on the downlink. The parameter_(SRS_offset) refers to a power offset. The parameter ƒ(i) refers to aclosed loop component that uses feedback from the UE 120 to modify thetransmit power (an example of a function for closed loop control forchanging a power level used for transmitting by the UE on the uplinkbased on feedback from the BS).

In certain aspects, in closed loop power control function ƒ(i) for PUSCH(and similarly for SRS) accumulation can be enabled or disabled, meaningthat the power control function either accumulates values from previoussubframes (e.g., ƒ(i)=ƒ(i−1)+δ(i−K), where δ(i−K) is a transmit powercontrol (TPC) command received by the UE 120 from BS 110 in subframei−K) or does not accumulate values from previous subframes (e.g.,ƒ(i)=δ(i−K)).

In certain aspects, in closed loop power control function g(i) for PUCCHaccumulation may be enabled or disabled

$\left( {{e.g.},{{g(i)} = {{g\left( {i - 1} \right)} + {\sum\limits_{0}^{M - 1}{\delta\left( {i - K} \right)}}}},} \right.$where M is the number of HARQ-ACK bundling).

The UE 120 may utilize beamforming to transmit signals to the BS 110(e.g., to one or more TRPs of the BS 110). Accordingly, the UE 120 maytransmit a signal as a directed beam (also referred to as spatial beams)to the BS 110. Similarly, the BS 110 may transmit signals to the UE 120on one or more downlink channels (e.g., PDSCH, PDCCH, etc.). The BS 110may also utilize beamforming to transmit signals as beams to the UE 120.

Uplink power control for multiple beams may present certain challenges.For example, the target SINR for transmissions on the uplink at the BS110 may be different for different beams (e.g., be beam specific (e.g.,per multi-panel, TRP, BS, etc.)). In addition, path loss estimates atthe UE 120 may be different for different beams (e.g., be beamspecific). In certain aspects, UL and DL may be reciprocal so thatdownlink RS may be used for uplink PL estimation. Further, in certainaspects, interference may be different for different beams (e.g., bebeam specific). Accordingly, certain techniques herein provide for oneor more parameters used for performing uplink control to be configuredon a per beam basis, due to the beam specific nature of certainparameters as discussed.

As discussed, PL estimates are made at the UE 120 based on RStransmitted by the BS 110. In certain aspects, the transmit power usedby the BS 110 for a given RS may be based on or account for thetransmission strategy from the BS 110 to the UE 120 (e.g., transmissionfrom multiple TRPs, multi-panel transmission, etc.). The RS may be oneor more of the following: secondary synchronization signal (SSS),demodulation reference signal (DMRS), channel state informationreference signal (CSI-RS). For example, if the power offset between SSSand DMRS for PBCH is known by UE 120, both SSS and DMRS for PBCH of asynchronization signal (SS) block may be used as RS. In another example,if the power offset between SSS and DMRS for PBCH is not known by UE120, SSS only of a SS block may be used as RS. In another example, aCSI-RS specific to UE 120 may be used. Any combination of RSs mayfurther be used.

In certain aspects, the RS are received at UE 120 for a given transmitbeam and PL is estimated/computed based on the transmit beam used forreception of the RS by the UE 120. In certain aspects, the PL estimationis a function of a beam pair link including a transmit beam of BS 110used to transmit RS, and a receive beam of UE 120 used to receive RS.The PL estimation may be used for uplink power control for a transmitbeam of the UE 120 associated with the beam pair link.

In certain aspects, the one or more parameters used for performinguplink control to be configured on a per beam basis may be a P₀parameter and/or a compensation factor. In certain aspects, the BS 110may be configured to configure the P₀ parameter and/or the compensationfactor at the UE 120 by transmitting a message (e.g., in downlinkcontrol information (DCI) that points to a table configured by RRC orconfigured in UE 120, radio resource control (RRC) message (e.g., adedicated message), or media access control-control element (MAC-CE))indicating the P₀ parameter and/or the compensation factor to the UE120. The UE 120 may then utilize the indicated P₀ parameter and/or thecompensation factor for uplink power control, such as utilizing theequations discussed.

In certain aspects, a BS 110 may communicate with UE 120 (e.g., on theUL/DL) using one or more TRPs. For example, BS 110 may switch fromcommunicating with UE 120 from a first TRP to a second TRP. The BS 110may be configured to use the same identifier for communication from theTRPs (e.g., a physical cell identifier (PCI)), so the UE 120 may not beable to distinguish between transmission from the different TRPs.Further, the beam used for communicating with the UE 120 may change fromthe first TRP to the second TRP. Accordingly, in certain aspects, BS 110determines an updated P₀ parameter and/or compensation factor for uplinkpower control for UE 120 when switching TRPs used for communication, andindicates the updated P₀ parameter and/or the update compensation factorto the UE 120.

In certain aspects, a BS 110 may transmit different types of RS to UE120 for PL estimation as discussed. In certain aspects, the RS may bebeam specific (e.g., based on a width of the beam). Accordingly, incertain aspects, BS 110 determines an updated P₀ parameter and/orcompensation factor for uplink power control for UE 120 when switchingRS type (e.g., from a first type to a second type, such as broad beam(e.g., NR-SS) to narrow beam (e.g., CSI-RS)) transmitted to UE 120, andindicates the updated P₀ parameter and/or the update compensation factorto the UE 120.

In certain aspects, BS 110 determines a different P₀ parameter and/orcompensation factor for uplink power control for UE 120 for each beampair link between the BS 110 and the UE 120. In certain aspects, onebeam pair link may be designated a primary link and the remaining beampair links may be designated as secondary links. In certain aspects, theBS 110 indicates the actual value for P₀ parameter and/or compensationfactor for the primary link to the UE 120. In certain aspects, the BS110 indicates an offset from the value for P₀ parameter and/orcompensation factor for the primary link indicated for each of thesecondary links. For example, the UE 120 may utilize the offset for asecondary link and the value of the primary link (e.g., sum of the two)to determine the value for P₀ parameter and/or compensation factor touse for the secondary link.

In certain aspects, a BS 110 may communicate with UE 120 (e.g., on theUL/DL) using a first beam and then may switch from communicating with UE120 using the first beam to a second beam. In certain aspects, if thefirst beam and the second beam are QCLed (quasi-co-located), the BS 110may indicate to the UE 120 to use the same P₀ parameter and/orcompensation factor as used for the first beam for the second beam. Incertain aspects, the BS 110 may determine and indicate to the UE 120 touse a different P₀ parameter and/or compensation factor for the secondbeam.

In certain aspects, a BS 110 may transmit RS (e.g., CSI-RS) on aplurality of resources (e.g., resource blocks (RBs), frequencyresources, etc.) to UE 120. These different resources may be used totransmit on the uplink by the UE 120. In certain aspects, the pluralityof resources are divided into a plurality of different subsets of theplurality of resources (e.g., different resource(s) in each subset). Incertain aspects, BS 110 determines different P₀ parameters and/orcompensation factors to use for performing uplink control for each ofthe different subsets and indicates these to the UE 120 for powercontrol for transmission on the different subsets. In certain aspects,the BS 110 indicates the actual value for P₀ parameter and/orcompensation factor for a primary subset to the UE 120. In certainaspects, the BS 110 indicates an offset from the value for P₀ parameterand/or compensation factor for the primary subset indicated for each ofthe remaining subsets. In certain aspects, different subsets may be usedfor communication with different TRPs of BS 110.

In certain aspects, the one or more parameters used for performinguplink control to be configured on a per beam basis may be a step size(e.g., indicated in a TPC command) for changing a power level used fortransmitting by the UE 120 on the uplink. In certain aspects, BS 110determines the step size based on beam width (e.g., narrow or broad,such as a larger step size for narrower beams and a smaller step sizefor broader beams due to the fast change of beamforming gain of narrowbeam) of the beam and transmits an indication of the step size to UE120, which uses the step size indicated for uplink power control for thebeam. In some aspects, BS 110 indicates a default step size to use forall beams at UE 120, and further indicates different step sizes forbeams as needed.

In certain aspects, the one or more parameters used for performinguplink control to be configured on a per beam basis may be PL estimatefor a path between the UE 120 and the BS 110. In certain aspects, BS 110is configured to group a number of beams (e.g., NR-SS or CSI-RS) totransmit RS to UE 120 to use for PL estimation. In certain aspects, theBS 110 indicates in a message to UE 120 a function to use based on theRS for PL estimation. For example, the function may be a maximum,average, etc. of a RSRP of one or more of the beams.

In certain aspects, BS 110 may configure UE 120 to apply PL filteringbased on the PL estimate for uplink power control by transmitting anindication in a message to UE 120. In certain aspects, a BS 110 maycommunicate with UE 120 (e.g., on the UL/DL) using a first beam and thenmay switch from communicating with UE 120 using the first beam to asecond beam. Based on the switch, the BS 110 may configure UE 120 toreset PL filtering by deleting a history associated with the path losshistory by transmitting an indication in a message to UE 120.

In certain aspects, the one or more parameters used for performinguplink control to be configured on a per beam basis may be a function(e.g., f(i), g(i), etc.) for closed loop control for changing a powerlevel used for transmitting by the UE 120 on the uplink based onfeedback from the BS 110. In certain aspects, the closed loop control isupdated to maintain received power at the BS 110 (e.g., during a P₂ andP₃ procedure). In certain aspects (e.g., in a P₁ procedure), if BS 110indicates to UE 120 a new P₀ parameter to use for uplink power control,the BS 110 may further indicate to UE 120 to reset the closed loopcontrol to 0 for the next subframe or use the previous closed loopcontrol value for the next subframe. In certain aspects, if BS 110 doesnot indicate to UE 120 to use a new P₀ parameter, the BS 110 mayindicate to UE 120 to use the next closed loop control value or use theprevious closed loop control value for the next subframe or update tomaintain received power at the BS 110.

FIG. 8 illustrates example operations 800 for uplink power control for aUE, in accordance with certain aspects. According to certain aspects,operations 800 may be performed by a BS (e.g., one or more of the BSs110).

Operations 800 begin at 802 where the BS determines a firstconfiguration of one or more parameters for uplink power control at auser equipment (UE) based on a first spatial beam selected, from aplurality of spatial beams, for uplink communication of the UE. At 804,the BS transmits a first indication of the first configuration to theUE.

FIG. 9 illustrates a communications device 900 that may include variouscomponents (e.g., corresponding to means-plus-function components)configured to perform operations for the techniques disclosed herein,such as the operations illustrated in FIG. 8. The communications device900 includes a processing system 902 coupled to a transceiver 908. Thetransceiver 908 is configured to transmit and receive signals for thecommunications device 900 via an antenna 910, such as the various signaldescribed herein. The processing system 902 may be configured to performprocessing functions for the communications device 900, includingprocessing signals received and/or to be transmitted by thecommunications device 900.

The processing system 902 includes a processor 904 coupled to acomputer-readable medium/memory 912 via a bus 906. In certain aspects,the computer-readable medium/memory 912 is configured to storeinstructions that when executed by processor 904, cause the processor904 to perform the operations illustrated in FIG. 8, or other operationsfor performing the various techniques discussed herein.

In certain aspects, the processing system 902 further includes adetermining component 914 for performing the operations illustrated in802 of FIG. 8. Additionally, the processing system 902 includes atransmitting component 916 for performing the operations illustrated in804 of FIG. 8. The determining component 914 and transmitting component916 may be coupled to the processor 904 via bus 906. In certain aspects,the determining component 914 and transmitting component 916 may behardware circuits. In certain aspects, the determining component 914 andtransmitting component 916 may be software components that are executedand run on processor 904.

The methods disclosed herein comprise one or more steps or actions forachieving the described method. The method steps and/or actions may beinterchanged with one another without departing from the scope of theclaims. In other words, unless a specific order of steps or actions isspecified, the order and/or use of specific steps and/or actions may bemodified without departing from the scope of the claims.

As used herein, a phrase referring to “at least one of” a list of itemsrefers to any combination of those items, including single members. Asan example, “at least one of: a, b, or c” is intended to cover a, b, c,a-b, a-c, b-c, and a-b-c, as well as any combination with multiples ofthe same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b,b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c).

As used herein, the term “determining” encompasses a wide variety ofactions. For example, “determining” may include calculating, computing,processing, deriving, investigating, looking up (e.g., looking up in atable, a database or another data structure), ascertaining and the like.Also, “determining” may include receiving (e.g., receiving information),accessing (e.g., accessing data in a memory) and the like. Also,“determining” may include resolving, selecting, choosing, establishingand the like.

The previous description is provided to enable any person skilled in theart to practice the various aspects described herein. Variousmodifications to these aspects will be readily apparent to those skilledin the art, and the generic principles defined herein may be applied toother aspects. Thus, the claims are not intended to be limited to theaspects shown herein, but is to be accorded the full scope consistentwith the language claims, wherein reference to an element in thesingular is not intended to mean “one and only one” unless specificallyso stated, but rather “one or more.” Unless specifically statedotherwise, the term “some” refers to one or more. All structural andfunctional equivalents to the elements of the various aspects describedthroughout this disclosure that are known or later come to be known tothose of ordinary skill in the art are expressly incorporated herein byreference and are intended to be encompassed by the claims. Moreover,nothing disclosed herein is intended to be dedicated to the publicregardless of whether such disclosure is explicitly recited in theclaims. No claim element is to be construed under the provisions of 35U.S.C. § 112, sixth paragraph, unless the element is expressly recitedusing the phrase “means for” or, in the case of a method claim, theelement is recited using the phrase “step for.”

The various operations of methods described above may be performed byany suitable means capable of performing the corresponding functions.The means may include various hardware and/or software component(s)and/or module(s), including, but not limited to a circuit, anapplication specific integrated circuit (ASIC), or processor. Generally,where there are operations illustrated in figures, those operations mayhave corresponding counterpart means-plus-function components withsimilar numbering.

For example, means for transmitting and/or means for receiving maycomprise one or more of a transmit processor 420, a TX MIMO processor430, a receive processor 438, or antenna(s) 434 of the base station 110and/or the transmit processor 464, a TX MIMO processor 466, a receiveprocessor 458, or antenna(s) 452 of the user equipment 120.Additionally, means for generating, means for allocating, and/or meansfor determining may comprise one or more processors, such as thecontroller/processor 440 of the base station 110 and/or thecontroller/processor 480 of the user equipment 120.

The various illustrative logical blocks, modules and circuits describedin connection with the present disclosure may be implemented orperformed with a general purpose processor, a digital signal processor(DSP), an application specific integrated circuit (ASIC), a fieldprogrammable gate array (FPGA) or other programmable logic device (PLD),discrete gate or transistor logic, discrete hardware components, or anycombination thereof designed to perform the functions described herein.A general-purpose processor may be a microprocessor, but in thealternative, the processor may be any commercially available processor,controller, microcontroller, or state machine. A processor may also beimplemented as a combination of computing devices, e.g., a combinationof a DSP and a microprocessor, a plurality of microprocessors, one ormore microprocessors in conjunction with a DSP core, or any other suchconfiguration.

If implemented in hardware, an example hardware configuration maycomprise a processing system in a wireless node. The processing systemmay be implemented with a bus architecture. The bus may include anynumber of interconnecting buses and bridges depending on the specificapplication of the processing system and the overall design constraints.The bus may link together various circuits including a processor,machine-readable media, and a bus interface. The bus interface may beused to connect a network adapter, among other things, to the processingsystem via the bus. The network adapter may be used to implement thesignal processing functions of the PHY layer. In the case of a userterminal 120 (see FIG. 1), a user interface (e.g., keypad, display,mouse, joystick, etc.) may also be connected to the bus. The bus mayalso link various other circuits such as timing sources, peripherals,voltage regulators, power management circuits, and the like, which arewell known in the art, and therefore, will not be described any further.The processor may be implemented with one or more general-purpose and/orspecial-purpose processors. Examples include microprocessors,microcontrollers, DSP processors, and other circuitry that can executesoftware. Those skilled in the art will recognize how best to implementthe described functionality for the processing system depending on theparticular application and the overall design constraints imposed on theoverall system.

If implemented in software, the functions may be stored or transmittedover as one or more instructions or code on a computer readable medium.Software shall be construed broadly to mean instructions, data, or anycombination thereof, whether referred to as software, firmware,middleware, microcode, hardware description language, or otherwise.Computer-readable media include both computer storage media andcommunication media including any medium that facilitates transfer of acomputer program from one place to another. The processor may beresponsible for managing the bus and general processing, including theexecution of software modules stored on the machine-readable storagemedia. A computer-readable storage medium may be coupled to a processorsuch that the processor can read information from, and write informationto, the storage medium. In the alternative, the storage medium may beintegral to the processor. By way of example, the machine-readable mediamay include a transmission line, a carrier wave modulated by data,and/or a computer readable storage medium with instructions storedthereon separate from the wireless node, all of which may be accessed bythe processor through the bus interface. Alternatively, or in addition,the machine-readable media, or any portion thereof, may be integratedinto the processor, such as the case may be with cache and/or generalregister files. Examples of machine-readable storage media may include,by way of example, RAM (Random Access Memory), flash memory, ROM (ReadOnly Memory), PROM (Programmable Read-Only Memory), EPROM (ErasableProgrammable Read-Only Memory), EEPROM (Electrically ErasableProgrammable Read-Only Memory), registers, magnetic disks, opticaldisks, hard drives, or any other suitable storage medium, or anycombination thereof. The machine-readable media may be embodied in acomputer-program product.

A software module may comprise a single instruction, or manyinstructions, and may be distributed over several different codesegments, among different programs, and across multiple storage media.The computer-readable media may comprise a number of software modules.The software modules include instructions that, when executed by anapparatus such as a processor, cause the processing system to performvarious functions. The software modules may include a transmissionmodule and a receiving module. Each software module may reside in asingle storage device or be distributed across multiple storage devices.By way of example, a software module may be loaded into RAM from a harddrive when a triggering event occurs. During execution of the softwaremodule, the processor may load some of the instructions into cache toincrease access speed. One or more cache lines may then be loaded into ageneral register file for execution by the processor. When referring tothe functionality of a software module below, it will be understood thatsuch functionality is implemented by the processor when executinginstructions from that software module.

Also, any connection is properly termed a computer-readable medium. Forexample, if the software is transmitted from a website, server, or otherremote source using a coaxial cable, fiber optic cable, twisted pair,digital subscriber line (DSL), or wireless technologies such as infrared(IR), radio, and microwave, then the coaxial cable, fiber optic cable,twisted pair, DSL, or wireless technologies such as infrared, radio, andmicrowave are included in the definition of medium. Disk and disc, asused herein, include compact disc (CD), laser disc, optical disc,digital versatile disc (DVD), floppy disk, and Blu-ray® disc where disksusually reproduce data magnetically, while discs reproduce dataoptically with lasers. Thus, in some aspects computer-readable media maycomprise non-transitory computer-readable media (e.g., tangible media).In addition, for other aspects computer-readable media may comprisetransitory computer-readable media (e.g., a signal). Combinations of theabove should also be included within the scope of computer-readablemedia.

Thus, certain aspects may comprise a computer program product forperforming the operations presented herein. For example, such a computerprogram product may comprise a computer-readable medium havinginstructions stored (and/or encoded) thereon, the instructions beingexecutable by one or more processors to perform the operations describedherein. For example, instructions for perform the operations describedherein and illustrated in FIG. 8.

Further, it should be appreciated that modules and/or other appropriatemeans for performing the methods and techniques described herein can bedownloaded and/or otherwise obtained by a user terminal and/or basestation as applicable. For example, such a device can be coupled to aserver to facilitate the transfer of means for performing the methodsdescribed herein. Alternatively, various methods described herein can beprovided via storage means (e.g., RAM, ROM, a physical storage mediumsuch as a compact disc (CD) or floppy disk, etc.), such that a userterminal and/or base station can obtain the various methods uponcoupling or providing the storage means to the device. Moreover, anyother suitable technique for providing the methods and techniquesdescribed herein to a device can be utilized.

It is to be understood that the claims are not limited to the preciseconfiguration and components illustrated above. Various modifications,changes and variations may be made in the arrangement, operation anddetails of the methods and apparatus described above without departingfrom the scope of the claims.

What is claimed is:
 1. A method for performing uplink power control at abase station (BS), the method comprising: determining a switch of a userequipment (UE) from using a first reference signal received by the UEfrom the BS for uplink power control to a second reference signal;determining a first configuration of one or more parameters for uplinkpower control at the UE based on the switch, wherein the secondreference signal is associated with the first configuration, and thefirst reference signal is associated with a second configuration of theone or more parameters that is different than the first configuration;and transmitting a first indication of the first configuration to theUE.
 2. The method of claim 1, wherein the one or more parameterscomprise a target received power at the BS for signals sent from the UEto the BS on the uplink.
 3. The method of claim 1, wherein the one ormore parameters comprise a compensation factor.
 4. The method of claim1, wherein the BS comprises a plurality of transmission reception points(TRPs) for communicating with the UE, each of the TRPs being configuredto use a same identifier for communications, and further comprising:determining a second switch of the UE from communicating with a firstTRP of the plurality of TRPs to a second TRP of the plurality of TRPs;determining an updated configuration of the one or more parameters basedon the second switch; and transmitting a second indication of theupdated configuration to the UE.
 5. The method of claim 1, wherein thefirst configuration is used for uplink power control by the UE on afirst spatial beam of a plurality of spatial beams, and furthercomprising: determining a third configuration of the one or moreparameters for uplink power control at the UE based a second spatialbeam selected, from the plurality of spatial beams, for uplinkcommunications of the UE, wherein the third configuration is used foruplink power control by the UE on the second spatial beam; andtransmitting a second indication of the third configuration to the UE,wherein the second indication of the third configuration indicates anoffset between the first configuration of the one or more parameters andthe third configuration.
 6. The method of claim 1, wherein the firstconfiguration is used for uplink power control by the UE on a firstspatial beam of a plurality of spatial beams, and further comprising:determining to use the first configuration of the one or more parametersfor uplink power control at the UE for a second spatial beam of theplurality of spatial beams, wherein the first spatial beam and thesecond spatial beam are quasi-co-located; and transmitting a secondindication to the UE to use the first configuration for the secondspatial beam.
 7. The method of claim 1, wherein the one or moreparameters comprise a step size for changing a power level used fortransmitting by the UE.
 8. The method of claim 7, wherein the step sizeis based on a width of the first spatial beam.
 9. The method of claim 1,wherein the one or more parameters comprise a path loss estimate for apath between the UE and the BS, and further comprising: transmitting aplurality of different reference signals on a plurality of spatial beamsto the UE from the BS, wherein the first indication indicates a functionto apply to all of the plurality of different reference signals at theUE to determine the path loss estimate.
 10. The method of claim 9,further comprising: transmitting a second indication to the UE toperform path loss filtering based on the path loss estimate; determininga second switch of the UE from using a first spatial beam to a secondspatial beam; and transmitting a third indication to the UE toreconfigure path loss filtering based on the second switch.
 11. Themethod of claim 1, further comprising: determining a second switch ofthe UE from using a second spatial beam to a first spatial beam, whereinthe one or more parameters comprise a function for closed loop controlfor changing a power level used for transmitting by the UE based onfeedback from the BS, and wherein the first indication indicates toreset the function to zero or use a function used for the second spatialbeam for the first spatial beam.
 12. A base station (BS) comprising: amemory; and a processor coupled to the memory, the processor beingconfigured to: determine a switch of a user equipment (UE) from using afirst reference signal received by the UE from the BS for uplink powercontrol to a second reference signal; determine a first configuration ofone or more parameters for uplink power control at the UE based on theswitch, wherein the second reference signal is associated with the firstconfiguration, and the first reference signal is associated with asecond configuration of the one or more parameters that is differentthan the first configuration; and transmit a first indication of thefirst configuration to the UE.
 13. The base station of claim 12, whereinthe one or more parameters comprise a target received power at the BSfor signals sent from the UE to the BS on the uplink.
 14. The basestation of claim 12, wherein the one or more parameters comprise acompensation factor.
 15. The base station of claim 12, wherein the BScomprises a plurality of transmission reception points (TRPs) forcommunicating with the UE, each of the TRPs being configured to use asame identifier for communications, and wherein the processor is furtherconfigured to: determine a second switch of the UE from communicatingwith a first TRP of the plurality of TRPs to a second TRP of theplurality of TRPs; determine an updated configuration of the one or moreparameters based on the second switch; and transmit a second indicationof the updated configuration to the UE.
 16. The base station of claim12, wherein the first configuration is used for uplink power control bythe UE on a first spatial beam of a plurality of spatial beams, andwherein the processor is further configured to: determine a thirdconfiguration of the one or more parameters for uplink power control atthe UE based a second spatial beam selected, from the plurality ofspatial beams, for uplink communications of the UE, wherein the thirdconfiguration is used for uplink power control by the UE on the secondspatial beam; and transmit a second indication of the thirdconfiguration to the UE, wherein the second indication of the thirdconfiguration indicates an offset between the first configuration of theone or more parameters and the third configuration.
 17. The base stationof claim 12, wherein the first configuration is used for uplink powercontrol by the UE on a first spatial beam of a plurality of spatialbeams, and wherein the processor is further configured to: determine touse the first configuration of the one or more parameters for uplinkpower control at the UE for a second spatial beam of the plurality ofspatial beams, wherein the first spatial beam and the second spatialbeam are quasi-co-located; and transmit a second indication to the UE touse the first configuration for the second spatial beam.
 18. The basestation of claim 12, wherein the one or more parameters comprise a stepsize for changing a power level used for transmitting by the UE.
 19. Thebase station of claim 18, wherein the step size is based on a width ofthe first spatial beam.
 20. The base station of claim 12, wherein theone or more parameters comprise a path loss estimate for a path betweenthe UE and the BS, and wherein the processor is further configured to:transmit a plurality of different reference signals on a plurality ofspatial beams to the UE from the BS, wherein the first indicationindicates a function to apply to all of the plurality of differentreference signals at the UE to determine the path loss estimate.
 21. Thebase station of claim 20, wherein the processor is further configuredto: transmit a second indication to the UE to perform path lossfiltering based on the path loss estimate; determine a second switch ofthe UE from using a first spatial beam to a second spatial beam; andtransmit a third indication to the UE to reconfigure path loss filteringbased on the second switch.
 22. The base station of claim 12, whereinthe processor is further configured to: determine a second switch of theUE from using a second spatial beam to a first spatial beam, wherein theone or more parameters comprise a function for closed loop control forchanging a power level used for transmitting by the UE based on feedbackfrom the BS, and wherein the first indication indicates to reset thefunction to zero or use a function used for the second spatial beam forthe first spatial beam.
 23. A base station (BS) comprising: means fordetermining a switch of a user equipment (UE) from using a firstreference signal received by the UE from the BS for uplink power controlto a second reference signal; means for determining a firstconfiguration of one or more parameters for uplink power control at theUE based on the switch, wherein the second reference signal isassociated with the first configuration, and the first reference signalis associated with a second configuration of the one or more parametersthat is different than the first configuration; and means fortransmitting a first indication of the first configuration to the UE.24. The base station of claim 23, wherein the one or more parameterscomprise a target received power at the BS for signals sent from the UEto the BS on the uplink.
 25. The base station of claim 23, wherein theone or more parameters comprise a compensation factor.
 26. Anon-transitory computer readable storage medium that stores instructionsthat when executed by a base station (BS) causes the base station toperform a method for performing uplink power control at the BS, themethod comprising: determining a switch of a user equipment (UE) fromusing a first reference signal received by the UE from the BS for uplinkpower control to a second reference signal; determining a firstconfiguration of one or more parameters for uplink power control at theUE based on the switch, wherein the second reference signal isassociated with the first configuration, and the first reference signalis associated with a second configuration of the one or more parametersthat is different than the first configuration; and transmitting a firstindication of the first configuration to the UE.
 27. The non-transitorycomputer readable storage medium of claim 26, wherein the one or moreparameters comprise a target received power at the BS for signals sentfrom the UE to the BS on the uplink.
 28. The non-transitory computerreadable storage medium of claim 26, wherein the one or more parameterscomprise a compensation factor.